JP2012044218A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device that can achieve high output and has a radiator which is excellent in productivity and heat dissipation.SOLUTION: A light emitting device is excellent in productivity of a radiator 3, because a portion whose thickness is increased by laminating thin plates is formed by integrating a radiation plate 30 formed of a plate material with high thermal conductivity at a caulking part 31. In addition, the radiator 3 having proper heat dissipation in accordance with the number of use of an LED element 20 and a calorific value can be manufactured, because the number of the radiation plate 30 can be increased or decreased easily and a shape of the heat dissipation can be changed easily in accordance with a desired heat dissipation characteristic.

Description

  The present invention relates to a light-emitting device using a light-emitting diode (LED) element as a light source, and more particularly to a light-emitting device that excels in heat dissipation due to light emission of an LED element and is excellent in productivity.

  LEDs are suitable for use as a light source in terms of environmental performance and power saving, and are expected to be used in a wide range of applications such as small electronic devices, lighting fixtures, and lamps as white light sources in addition to fluorescent light sources. Yes. Along with this, light emitting devices using various LEDs of high output type and large light quantity type have been proposed in recent years, but the problem of heat associated with light emission has become prominent, realizing a high output type LED light emitting device. In doing so, how to ensure heat dissipation is an important issue.

  As a means for improving the heat dissipation of the LED light-emitting device, a heat dissipation plate made of a highly heat-conductive plate material, mounted with a light source part using the LED element as a light source, and having a heat dissipation width in the back direction of the light source part There is known a light emitting device having the above (for example, refer to Patent Document 1).

  The light emitting device of Patent Document 1 has an LED element mounting portion on the end face of the heat sink, and the two heat sinks are cross-shaped by inserting another heat sink into a slit provided in the heat sink. It is assembled and has a heat dissipation width in the back direction of the LED element. Moreover, a heat sink can also be formed by an extrusion process.

  According to the light emitting device of Patent Document 1, the radiation of the light emitted from the LED element is inhibited by assembling a heat dissipation plate having a heat dissipation width in a direction parallel to the optical axis direction of the LED element and providing a heat radiator. Therefore, excellent heat transfer properties can be obtained, and good air heat dissipation can be achieved.

International Publication No. 2005/043637 Pamphlet (7th page, FIG. 1, FIG. 9, FIG. 10, FIG. 12)

However, the light emitting device of Patent Document 1 has the following problems.
(1) In the case where the heat radiator is formed by assembling the heat radiating plate, it is necessary to appropriately position the heat radiating plate by inserting, fixing, etc., and there is a problem that the assembly is complicated and it is difficult to improve the productivity. .
(2) In the case where the heat radiating body is formed by extrusion, it is necessary to form a heat radiating plate so as to have a strength that can withstand the extruding processing, and there is a limit to downsizing the light emitting device and thinning the heat radiating plate.

  Accordingly, an object of the present invention is to provide a light emitting device including a heat radiating body that can cope with high output and is excellent in productivity and heat dissipation.

  (1) In order to achieve the above object, the present invention includes a light source having a light emitting element mounted on the front surface and an element mounting substrate provided with a wiring pattern and a heat radiation pattern metallized on the back surface, and a radiator. The wiring pattern is electrically joined to a wiring board, and the heat radiation pattern is joined to the heat radiator from an opening provided in the wiring board, and the wiring pattern, the wiring board, and the heat radiation pattern are joined. And the heat dissipating member are bonded by the same bonding material, and the light source directly transfers heat generated from the light emitting element to the heat dissipating member through the heat dissipating pattern.

  (2) A plurality of the light emitting elements described in (1) above are mounted on the surface of the element mounting substrate, and the thickness of the element mounting substrate is thinner than the mounting interval of the plurality of light emitting elements. Features.

  (3) Moreover, the said joining material as described in said (1) or (2) consists of solder or Au-Sn, It is characterized by the above-mentioned.

  (4) The light source according to any one of (1) to (3) is characterized in that an area in plan view is within 10 times a total area of the plurality of light emitting elements.

  (5) The light-emitting element according to any one of (1) to (4) above is formed by sealing with glass.

(6) The glass described in (5) above has a thermal expansion coefficient equivalent to that of the light emitting element and the element mounting substrate.

  (7) The radiator according to any one of the above (1) to (6) is characterized in that a black layer is formed on a surface.

  (8) The said heat radiator as described in any one of said (1)-(7) has a reflectance of 70% or more, It is characterized by the above-mentioned.

  (9) The radiator according to any one of (7) to (8) is characterized in that a surface is plated.

  According to the light emitting device of the present invention, it is possible to cope with high output by including a heat radiator that is excellent in productivity and heat dissipation.

1 is a perspective view of a light emitting device according to a first embodiment of the present invention. It is a principal part enlarged view which shows glass sealing LED and its mounting part. It is a longitudinal cross-sectional view of the LED element sealed by glass. It is principal part sectional drawing which shows LED as a light source replaced with glass sealing LED. It is a perspective view of the light-emitting device which concerns on the 2nd Embodiment of this invention. It is a perspective view of the light-emitting device which concerns on the 3rd Embodiment of this invention. It is the top view seen from the light extraction side of the light-emitting device which concerns on the 4th Embodiment of this invention. It is the top view seen from the light extraction side of the light-emitting device which concerns on the 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the light-emitting device which concerns on the 6th Embodiment of this invention. It is a perspective view of the light-emitting device which concerns on the 7th Embodiment of this invention. It is a principal part expanded sectional view which shows glass sealing LED and its mounting part. It is a front view of a light-emitting device. It shows a modification and is a front view of a light emitting device. It shows a modification and is a front view of a light emitting device. It shows a modification and is a front view of a light emitting device. It shows a modification and is a top view of a light emitting device. It shows a modification and is a front view of a light emitting device. It shows a modification and is a top view of a light emitting device. It is a side view of the light-emitting device which concerns on the 8th Embodiment of this invention. It is a top view of a light-emitting device. It shows a modification and is a top view of a light emitting device. It is a light-emitting device which concerns on the 9th Embodiment of this invention, Comprising: (a) is a side view, (b) is a top view. The modification of a light-emitting device is shown, (a) is a side view, (b) is a top view. The modification of a light-emitting device is shown, (a) is a longitudinal cross-sectional view, (b) is a top view. The modification of a light-emitting device is shown, (a) is a side view, (b) is a top view. It is a top view of the light-emitting device which shows a modification. It is a side view of the light-emitting device which shows a modification. It is a front view of the light-emitting device which shows a modification. It is a disassembled perspective view of the light-emitting device concerning the 10th Embodiment of this invention. It is a perspective view of a light-emitting device. It is a component figure of a radiator, (a) is a top view of an upper radiator, (b) is a bottom view of a lower radiator. It shows a modification and is a perspective view of a light emitting device. It shows a modification and is a perspective view of a light emitting device. It is a top view of the light-emitting device which shows the 11th Embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

[First Embodiment]
(Configuration of light-emitting device 1)
FIG. 1 is a perspective view of a light emitting device according to a first embodiment of the present invention. In the following description of the embodiment, the width direction of the light emitting device 1 is X, the thickness direction is Y, and the height direction is Z.

  The light-emitting device 1 includes a glass-sealed LED 2 formed by sealing an LED element with glass and a heat radiating body 3 formed by integrating a heat radiating plate 30 formed of a highly heat-conductive plate material at a caulking portion 31. The glass-sealed LED 2 is fixed to the upper surface of the radiator 3 and is electrically connected to the wiring layer 41 of the wiring substrate 4 provided on the upper surface of the radiator 3.

  FIG. 2 is an enlarged view of a main part showing a glass-sealed LED and its mounting portion, and FIG. 3 is a longitudinal sectional view of the LED element to be glass-sealed.

  The glass-sealed LED 2 includes an LED element 20 made of a GaN-based semiconductor material, an Al 2 O 3 substrate 21 on which the LED element 20 is mounted, and a glass sealing portion 22 made of low-melting glass that seals the LED element 20.

The Al ₂ O ₃ substrate 21 is made of a thermal expansion coefficient of 7.0 × ^{10 -6} / ℃ of _Al 2 _{O 3,} tungsten mounting side of the LED element 20 (W) - nickel (Ni) - gold (Au) or the like Circuit pattern 210 provided with the conductive material, a circuit pattern 211 formed of the same material as the circuit pattern 210 on the bottom surface opposite to the mounting side of the LED element 20, and provided penetrating from the mounting side to the bottom surface side. The via pattern 212 formed in the via hole 212A and the heat radiation pattern 213 provided by a high thermal conductivity material at the center lower part of the substrate have the via pattern 212 electrically connecting the circuit patterns 210 and 31.

  The wiring board 4 electrically connected to the circuit pattern 211 includes an insulating layer 40 as a base material, and a wiring layer 41 formed on the insulating layer 40 with a thin film of a conductive material such as a copper foil. An opening is provided in a portion where the lower heat radiation pattern 213 is located, and a heat radiation path to the heat radiator 3 is formed by fixing the heat radiation pattern 213 to the heat radiator 3. The insulating layer 40 can be formed of an insulating material such as polyimide or polyethylene.

The glass sealing portion 22 is made of a colorless and transparent low-melting glass that can be hot-pressed at 600 ° C., and has a thermal expansion coefficient (7 × 10 ⁻⁶ / ° C.) equivalent to that of the LED element 20 and the Al ₂ O ₃ substrate 21. have.

  As shown in FIG. 3, the LED element 20 has a buffer layer 291, an n-GaN layer 292, a light-emitting layer 293, and a p-type layer formed on a sapphire substrate 200 as a base substrate by MOCVD (Metal Organic Chemical Vapor Deposition) method. The n-side electrode 295 is provided on the n-GaN layer 292 which is formed by sequentially growing the -GaN layer 294 and is exposed by etching from the p-GaN layer 294 to the n-GaN layer 292. Yes. A p-contact electrode 296 is provided on the surface of the p-GaN layer 294 for current diffusion. The LED element 20 is electrically connected to the circuit pattern 210 of the Al 2 O 3 substrate 21 through the Au stud bump 5. In the first embodiment, the LED element 20 formed with a size of 600 μm square is used, but the LED element 20 of up to 3 mm can be used.

  The heat radiating body 3 is formed by press bending a heat radiating plate 30 made of copper having a thickness of 0.3 mm. In this embodiment, the heat radiating plate 30 is bent at both sides with the unprocessed heat radiating plate 30 as a center. This is a five-layer heat radiator 3 in which four heat dissipating plates 30 having different sizes are arranged. The heat radiating plate 30 is integrated by fixing the central portion of the plate in the thickness direction by caulking 31 parts. The heat radiating plate 30 has a reflectivity of 70% or more by plating, and ends in the width direction of each heat radiating plate 30. Are processed so as to be arranged radially as fins 30A. Thus, a gap is generated between the fins 30A. The heat radiator 3 is formed with a height (Z-direction dimension) of 50 mm, and a glass-sealed LED 2 is mounted on the center of the upper surface in FIG. ing.

  The caulking portion 31 performs V caulking on the laminated heat sinks 30 using a V-shaped mold, so that the caulked portion pushed out into the V shape frictionally bonds the heat sinks 30 to each other. Moreover, you may join by round V crimping or round crimping.

(Method for manufacturing light-emitting device 1)
Next, a method for manufacturing the light emitting device 1 will be described. First, the heat sink 30 having the shape of each part constituting the heat radiator 3 is formed by press bending a copper plate material. Next, the plurality of heat dissipation plates 30 are stacked in the thickness direction so as to form a predetermined heat dissipation shape. Next, the radiator 3 is formed by integrating the plurality of radiator plates 30 by caulking the stacked radiator plates 30. Next, the wiring board 4 is fixed to the upper surface of the heat sink 30 with an adhesive. Next, positioning is performed so that the circuit pattern 211 of the glass-sealed LED 2 is positioned on the wiring layer 41 of the wiring substrate 4, and the circuit pattern 211 and the wiring layer 41 are electrically connected by Au—Sn bonding and a heat radiation pattern. 213 is closely attached to the radiator 3. Next, the wiring layer 41 of the wiring board 4 is electrically connected to an external power supply unit (not shown).

(Operation of the light emitting device 1)
Below, operation | movement of the light-emitting device 1 of this Embodiment is demonstrated. First, when electric power is supplied from the power supply unit, a voltage is applied to the LED element 20 of the glass-sealed LED 2 via the wiring layer 41 of the wiring substrate 4, thereby causing the light emitting layer 203 of the LED element 20 to emit light. Due to this light emission, blue light having an emission wavelength of 470 nm is transmitted through the glass sealing portion 22 and radiated to the outside in the radiation range mainly in the Z direction of FIG. 1 and from the heat radiation pattern 213 at the bottom of the glass sealing portion LED2. The heat generated with the light emission of the element 20 is thermally conducted to the radiator 3. The heat radiating body 3 transfers heat transmitted from the glass-sealed LED 2 in the height direction to perform heat extraction, and dissipates heat from the fins 30 </ b> A to the atmosphere.

(Effects of the first embodiment)
According to the first embodiment of the present invention, the following effects can be obtained.
(1) Since the heat sink 30 formed of the plate material having high thermal conductivity is integrated by the caulking portion 31 and the thin plate is laminated to form a portion having a large thickness, the productivity of the radiator 3 is improved. Excellent. Further, since the number of the heat radiating plates 30 can be increased or decreased according to the desired heat radiating characteristics and the heat radiating shape can be easily changed, the heat radiating body having appropriate heat radiating properties according to the number of LED elements 20 used and the amount of heat generated. 3 can be manufactured. Moreover, since the glass-sealed LED serving as a heat source is disposed on the side surface of each heat radiating plate 30, the heat generated by the LED element 20 can be directly transferred to each heat radiating plate 30. For this reason, irrespective of the heat transfer degree between each heat sink 30, heat dissipation equivalent to what branched the front-end | tip of a bulk-shaped heat sink can be implement | achieved by a very simple method.
(2) Since the glass-sealed LED 2 mounted on the heat radiating body 3 and the heat radiating body 3 are coupled to each other with good thermal conductivity through the heat radiating pattern 213, the heat-drawing property of heat generated by light emission is improved, and the light-emitting device 1 is capable of imparting stable light emission characteristics over a long period of time to high output and large current application.
(3) By having the structure where the width direction edge part of each heat sink 30 is arrange | positioned radially, the atmospheric heat dissipation of the heat radiator 3 is improved. Moreover, the novel external appearance as the light-emitting device 1 can be provided.
(4) Since a glass-sealed LED is used for the light source part, even if the temperature rise of the light source part is not necessarily kept in the range of several tens of degrees Celsius, it has a large coefficient of thermal expansion like resin sealing, and is electrically affected by stress due to temperature change. There is no possibility of disconnection or deterioration of the light amount due to a decrease in transparency of the member. For this reason, even if the heat dissipation property of the heat dissipating body 3 is the same, in the glass sealing, it is possible to increase the output by supplying more power than in the case of resin sealing.

  In addition, in 1st Embodiment, although glass-sealed LED2 using the blue LED element 20 which radiates | emits blue light as a light source part was demonstrated, the LED element 20 which radiates | emits light of emission colors other than blue was used. Glass-sealed LED 2 may be used.

  Further, the glass sealing portion 22 is obtained by dispersing a phosphor such as YAG (Yttrium Aluminum Garnet) that emits yellow light when excited by blue light in a low melting glass, or as a phosphor layer in the low melting glass. It is good also as what radiates | emits white light based on the mixture of blue light and yellow light.

  Moreover, as the glass-sealed LED 2 that emits white light, an ultraviolet LED element that emits ultraviolet light having an emission wavelength of 370 nm is used, and a phosphor layer made of RGB phosphors formed in layers on the surface of the glass sealing portion 22 is used. The configuration may be such that white light is obtained by transmission.

  Further, the light source unit is not limited to the glass-sealed LED 2, and it is possible to mount a resin-sealed package using a resin such as silicone as a sealing material.

  The heat radiating body 3 may be one in which a heat radiating plate 30 made of an aluminum material is integrated by a caulking portion 31 instead of a copper material, and is formed of a material having a thermal conductivity equivalent to these. Also good. The thermal conductivity is more preferably 150 W / m · k or more. Further, the integration of the heat sink 30 is not limited to the above-described caulking, but may be performed by soldering using electric welding, solder, brazing material, or the like.

  FIG. 4 is a cross-sectional view of an essential part showing an LED as a light source replacing the glass-sealed LED.

  The LED 2 </ b> A includes a phosphor-containing silicone 23 that seals the LED element 20 and a Si submount 24 on which the LED element 20 is mounted, and is mounted on the wiring board 4.

  The phosphor-containing silicone 23 is formed by mixing YAG phosphor with silicone, and wavelength conversion that generates white light by mixing yellow light and blue light generated by being excited by blue light emitted from the LED element 20. Parts.

  The Si submount 24 includes a circuit pattern 24A provided on the LED element 20 mounting side, a conduction pattern 24B provided in a via hole formed through the submount while being electrically connected to the circuit pattern 24A, It has a heat radiation pattern 213 provided on the side opposite to the mounting surface of the LED element 20.

  The wiring substrate 4 includes an insulating layer 40, a wiring layer 41, and an Al vapor deposition film 42 provided as a light reflecting layer on the surface of the insulating layer 40. The conductive pattern 24B of the LED element 20 and the wiring layer 41 are electrically connected. An opening 4A is provided in the insulating layer 40 so as to be connected to each other. Further, a through hole 4 </ b> B for bringing the heat radiation pattern 213 provided on the Si submount 24 into contact with the heat radiator 3 is provided.

  Even when such a resin-sealed LED 2A is used as a light source, the heat accompanying the light emission of the LED element 20 can be efficiently transmitted to the heat radiating body 3, so that stable light emission characteristics can be obtained even for long-time continuous lighting.

[Second Embodiment]
(Configuration of light-emitting device 1)
FIG. 5 is a perspective view of a light emitting device according to the second embodiment of the present invention. In the following description, portions having the same configuration and function as those of the first embodiment are denoted by common reference numerals.

  This light-emitting device 1 is obtained by processing the end portions of the fins 30A constituting the heat dissipating body 3 described in the first embodiment into a corrugated plate, and the other configurations are the same as those in the first embodiment. is there.

(Effect of the second embodiment)
According to the second embodiment of the present invention, since the end portions of the fins 30A are processed into a corrugated plate shape, the heat dissipation area of this portion can be increased, and the heat dissipation can be improved. Moreover, not only this but embossing etc. may be given.

[Third Embodiment]
(Configuration of light-emitting device 1)
FIG. 6 is a perspective view of a light emitting device according to the third embodiment of the present invention.

  In the light emitting device 1, the glass-sealed LED 2 is mounted on the side surface of the heat radiating body 3, and light is emitted in the X direction that is the optical axis direction of the LED element 20. The heat dissipating body 3 of the third embodiment is obtained by cutting the heat dissipating body 3 described in the first embodiment in the vertical direction at the center, and the side surface serving as the cut surface is the mounting surface of the glass-sealed LED 2. ing. Note that the Z direction in FIG. 6 is a vertical direction in a windless state, which is the direction of natural convection caused by the heat sink becoming hot relative to the surrounding air, or the direction of flow of the surrounding air.

(Effect of the third embodiment)
According to the third embodiment of the present invention, the portion formed by laminating thin plates and having a large thickness is exposed in the side surface direction of the heat radiating body 3, so that it is other than the Z direction described in the first embodiment. High power light can also be emitted in the X direction. Moreover, since the heat radiating plate 3 is formed in a direction suitable for air-air cooling, the heat radiating body 3 is excellent in heat radiating effect, for example, stable light emission characteristics can be obtained even for a long time by excellent heat sinking. As described in the second embodiment, the end of the fin 30A may be processed into a corrugated plate shape.

  Moreover, although demonstrated as what mounted one glass-sealed LED2 used as a light source, it is not restricted to this, For example, it is good also as what mounted two or more in the Z direction.

[Fourth Embodiment]
(Configuration of light-emitting device 1)
FIG. 7 is a plan view seen from the light extraction side of the light emitting device according to the fourth embodiment of the present invention.

  The light-emitting device 1 includes nine blue LED elements 20 mounted on the radiator 3 described in the first embodiment, and a glass-sealed LED 2 that is glass-sealed with a glass sealing portion 22. Furthermore, it has the structure which provided the cylindrical case part 300 which consists of a 1-mm-thick copper material in the outer side of fin 30A. Case part 300 and fin 30A are fixed by Au-Sn bonding.

(Effect of the fourth embodiment)
According to the fourth embodiment of the present invention, the case portion 300 does not serve as an external radiation path for the light emitted from the LED element 20, so that the case portion 300 is formed by a thick portion and the radiator 3 is accommodated inside the case. As a result, the deformation of the fin 30A is protected, the air inductivity to the fin 30A is increased, and the heat dissipation can be improved. As shown in FIG. 6, the high-luminance glass-sealed LED 2 having a plurality of standard-size (300 μm square) LED elements 20 is not deficient in heat dissipation, has good heat drawability, and has a long time. Stable light emission characteristics can be imparted even under continuous energization conditions.

[Fifth Embodiment]
(Configuration of light-emitting device 1)
FIG. 8 is a plan view seen from the light extraction side of the light emitting device according to the fifth embodiment of the present invention.

  The light emitting device 1 includes a glass-sealed LED 2 mounted with the nine blue LED elements 20 described in the fourth embodiment, and includes a heat sink 30 having a thickness of 1 mm and a heat sink 30 having a thickness of 0.3 mm. The radiator plate 30 mounted on the radiator 3 and having a large thickness constitutes a case portion 300 whose end portion surrounds the periphery of the radiator 3 in a cylindrical shape.

(Effect of 5th Embodiment)
According to the fifth embodiment of the present invention, the case portion 300 can be integrally formed by folding back the thick heat sink 30 constituting the heat sink 3 around the heat sink 3. In addition to the preferable effects of the fourth embodiment, the light emitting device 1 having excellent mechanical strength can be obtained.

[Sixth Embodiment]
(Configuration of light-emitting device 1)
FIG. 9 is a longitudinal sectional view of a light emitting device according to a sixth embodiment of the present invention.

  The light emitting device 1 includes a reflecting mirror portion 50 that faces a light source having a paraboloid shape that focuses on a glass-sealed LED 2 made of an aluminum plate on the light extraction side of the light emitting device 1 described in the fourth embodiment. Attach and reflect the light emitted from the glass-sealed LED 2 on the reflecting mirror surface 50A facing the light source, and guide it to the back side of the glass-sealed LED 2 along the heat sink 30 so as to be taken out to the opposite side of the Z-axis direction. It is a thing.

(Effect of 6th Embodiment)
According to the sixth embodiment of the present invention, in addition to the preferable effects of the first to fifth embodiments, the heat radiation is excellent, and highly efficient external radiation can be realized. A light reflection type light emitting device 1 is obtained. The light reflected by the reflecting mirror surface 50 </ b> A is radiated to the outside of the case unit 300 through the gaps of the radiator 3 along the radiator plate 30.

  For example, when the glass-sealed LED 2 that emits white light is mounted on the radiator 3 to emit light, the light reflected by the reflecting mirror surface 50A does not differ in refraction angle depending on the wavelength as in the lens effect. By radiating outside the case unit 300 without color separation, not only high brightness but also a high-quality white light emitting device 1 can be obtained.

  In addition, the shape of the reflecting mirror part 50 which opposes a light source becomes a rotation paraboloid which makes the glass-sealed LED2 a focus, when parallel light is radiated | emitted outside. When the heat sink 30 is bent perpendicular to the Z axis, parallel light is radiated to the outside. Since the reflecting mirror portion radiates light in the direction along the heat sink 30, the ratio of the light reaching the heat sink 30 is minimized, and the light loss due to metal reflection absorption is also minimized. Can be high. In addition to this, when expanding the light distribution of the external radiation, it becomes a spheroidal surface and becomes an elliptical surface that is not a spheroidal surface in order to obtain a wider light distribution in either the X direction or the Y direction. May be determined. Moreover, although the structure which forms the reflective mirror part 50 with an aluminum plate was demonstrated, the reflective mirror shape was formed with resin and the mirror surface process by vapor deposition of Ag, Al, etc. may be performed.

[Seventh Embodiment]
(Configuration of Light Emitting Device 101)
FIG. 10 is a perspective view of a light emitting device according to the seventh embodiment of the present invention.

  The light emitting device 101 is formed by integrating a glass-sealed LED 102 as a light source formed by sealing a plurality of LED elements with glass and a heat radiating plate 130 formed of a highly heat-conductive plate material at a caulking portion 131. The heat radiating body 103 is formed. That is, the heat radiating body 103 has a plurality of heat radiating bodies 130 connected so that at least a part thereof is separated from each other. The glass-sealed LED 102 is fixed to the upper surface of the radiator 103 and is electrically connected to the wiring layer 140 of the wiring substrate 104 provided on the upper surface of the radiator 103.

  FIG. 11 is an enlarged cross-sectional view of a main part showing a glass-sealed LED and its mounting portion.

  As shown in FIG. 11, the glass-sealed LED 102 has a plurality of flip-chip GaN-based LED elements 20 and a multi-layer element mounting substrate 121 on which the plurality of LED elements 20 are mounted. Further, the glass-sealed LED 102 has a circuit pattern 110 on the front surface, a circuit pattern 111 on the back surface, and a via pattern 112 on both surfaces and layers of the element mounting substrate 121 made of Al 2 O 3 and having a thickness of 0.25 mm. Each circuit pattern 110, 111 includes W layers 110a, 111a formed on the surface of the element mounting substrate 121, and Ni layers 110b, 111b and Au layers 110c formed by plating the surfaces of the W layers 110a, 111a. , 111c. Furthermore, a heat dissipation pattern 113 that dissipates heat generated in each LED element 20 to the outside is formed on the surface opposite to the mounting surface of the element mounting substrate 121 by metallization. The heat dissipation pattern 113 is formed in the same process as the circuit pattern 111 on the back surface. The glass-sealed LED 102 has a glass sealing portion 122 that seals each LED element 20 and is bonded to the element mounting substrate 121 and contains the phosphor 107.

As shown in FIG. 10, the LED elements 20 that emit blue light are arranged in an array of 3 × 3 in the vertical and horizontal directions, and a total of nine LED elements 20 are mounted on one element mounting substrate 121. In this embodiment, the LED element 20 is 0.34 mm square in plan view and the distance between the vertical and horizontal directions is 600 μm, and the glass-sealed LED 102 is 2.7 mm square in plan view. That is, as for the thickness of the element mounting substrate 121, the mounting interval of the LED elements 20 is smaller. Further, the glass-sealed LED 102 has an area in plan view within 10 times the total area of the plurality of LED elements 20. The p-side electrode of each LED element 20 is composed of an ITO electrode and two relatively small p-side pad electrodes formed thereon. In the glass-sealed LED, the coefficient of thermal expansion of the element mounting substrate 121 and the glass sealing portion 122 is both small and equivalent, and further bonded by a chemical bond or an anchor effect. Even if it does not peel like a resin-sealed LED.

  The wiring substrate 104 electrically connected to the circuit pattern 111 on the back surface has an insulating layer 141 as a base material, and a wiring layer 140 formed on the insulating layer 141 with a thin film of a conductive material such as a copper foil. An opening is provided in a portion where the heat radiation pattern 113 is located at the lower center of the substrate, and a heat radiation path to the heat radiator 103 is formed by fixing the heat radiation pattern 113 to the heat radiator 103. The insulating layer 141 is made of an insulating material such as polyimide or polyethylene, for example.

The glass sealing part 122 is made of a colorless and transparent low-melting-point heat-fusing glass that can be hot-pressed at 600 ° C., and has a thermal expansion coefficient (6 × 10 ⁻⁶ / 6) equivalent to that of the LED element 20 and the element mounting substrate 121. ° C). That is, the glass sealing part 122 has a thermal expansion coefficient close to that of the LED element 20 as compared with an epoxy-based or silicone-based resin material. In the present embodiment, ZnO—SO ₂ —R ₂ O-based glass (R is at least one selected from Group I elements) is used for the glass sealing portion 122. In the glass sealing portion 122, the phosphor 107 is dispersed.

  The phosphor 107 is a yellow phosphor that emits yellow light having a peak wavelength in a yellow region when excited by blue light emitted from the light emitting layer 203 of the LED element 20. In the present embodiment, a YAG (Yttrium Aluminum Garnet) phosphor is used as the phosphor 107. The phosphor 107 may be a silicate phosphor or a mixture of YAG and silicate phosphor in a predetermined ratio.

  The heat radiating body 103 has a plurality of heat radiating plates 130 made of copper having a thickness of 0.3 mm. In the present embodiment, oxygen-free copper having a thermal conductivity of 400 W / m · K is used as the heat sink 130. Each heat dissipation plate 30 has an upper portion 130a whose plate surface is directed in the left-right direction, and a lower portion 130b that is inclined outward in the left-right direction from the lower end of the upper portion 130a and extends obliquely downward. Each heat sink 130 is formed by press bending in advance, and as shown in FIG. 12, the bending angle is set so that the lower portions 130b of the heat sinks 130 are separated from each other toward the lower end. Here, FIG. 12 is a front view of the light emitting device. In the present embodiment, a total of three sets of six heat radiating plates 130 are stacked at the upper portion 130a so as to have a symmetrical angle in the left-right direction.

  Each heat sink 130 is integrally fixed by a pair of upper and lower caulking portions 131 that penetrate each upper portion 130a in the thickness direction. Each of the heat sinks 130 has a reflectance of 70% or more by plating, and the lower portions 130b of the heat sinks 130 are arranged radially around the meeting portion of the heat sinks 30.

  The caulking part 131 performs V caulking on the laminated heat sink 130 using a V-shaped mold, and the caulked portion pushed out into the V shape joins the heat sinks 130 by friction. In addition, the caulking method of the caulking portion 131 is arbitrary, and for example, the heat radiating plates 130 may be joined by round V caulking or round caulking.

(Method for manufacturing light-emitting device 101)
Here, a method for manufacturing the light emitting device 101 will be described. First, a copper plate material is press-bended to form a heat dissipation plate 130 in which an upper part 130a and a lower part 130b are molded. Next, the heat radiating plates 130 are stacked in the thickness direction at the upper portion 130 a and caulked to the laminated heat radiating plates 130 to integrate the heat radiating plates 130 to form the heat radiating body 103. Next, the wiring substrate 104 is fixed to the upper surface of each heat sink 130 with an adhesive. Then, positioning is performed so that the circuit pattern 111 of the glass-sealed LED 102 is positioned on the wiring layer 140 of the wiring substrate 104, and the circuit pattern 111 and the wiring layer 140 are bonded by Au—Sn bonding at 300 ° C. to 350 ° C. in a nitrogen atmosphere. Are electrically connected to each other, and the heat radiation pattern 113 is brought into close contact with the heat radiator 103. Next, the wiring layer 140 of the wiring board 104 is electrically connected to an external power supply unit (not shown).

(Operation of Light Emitting Device 101)
Hereinafter, the operation of the light emitting device 101 of this embodiment will be described. First, when power is supplied from the power supply unit, a voltage is applied to each LED element 20 of the glass-sealed LED 102 via the wiring layer 140 of the wiring substrate 104, and light is emitted from the light emitting layer 203 of each LED element 20. Due to this light emission, blue light having an emission wavelength of 470 nm is transmitted through the glass sealing portion 122 and externally emitted to the radiation range mainly in the upward direction, and each LED element 20 from the heat radiation pattern 113 at the bottom of the glass sealing portion LED102. The heat generated with the light emission is conducted to the radiator 103. The heat dissipating body 103 transmits heat transmitted from the glass-sealed LED 102 in the height direction to conduct heat, and dissipates heat from the lower portion 130b.

(Effect of 7th Embodiment)
According to the seventh embodiment of the present invention, the following effects can be obtained.
(1) Since the glass-sealed LED 102 on which a plurality of LED elements 20 are mounted is provided, heat interaction in the element can be reduced and thermal resistance can be reduced as compared with the case where a large-size LED element is mounted. can do. That is, in the case of a large-size LED element, a plurality of LED elements 20 are in contact with each other. Therefore, even if the heat radiation amount to the element mounting substrate 121 per element area is the same, the plurality of LED elements 20 are spaced apart. The temperature rise of the LED element 20 can be suppressed to be lower in the case where the LED element 20 is disposed. In addition to this, in the glass-sealed LED 102 in which the thermal expansion coefficient is small and tensile stress is not generated on the LED element 20 due to the expansion of the sealing material even at a high temperature, the mounting strength of the LED element 20 may be small. The p-side electrode is composed of an ITO electrode and a relatively small p-side pad electrode formed on the ITO electrode, and is mounted with a total of two bumps, one each for the anode and cathode. Luminous efficiency is better than what is mounted.
(2) Since heat is extracted from the heat radiation pattern 113 at the bottom of the glass-sealed LED 102, the heat interaction between the LED elements 20 can be reduced, and this can also reduce the thermal resistance. In particular, since the thickness of the element mounting substrate 121 is thinner than the mounting interval of the LED elements 20, the heat generated in each LED element 20 is greater in the direction of the heat dissipation pattern 113 than in the direction of the adjacent LED elements 20. Will be transmitted. Therefore, the luminous efficiency can be improved also by this.
(3) Since the glass-sealed LED 102 is mounted with Au—Sn having a relatively high thermal conductivity, the heat dissipation efficiency to the heat radiating body 103 is higher than when mounted with solder or the like. In addition, although it is heated to 300 ° C. to 350 ° C. at the time of Au—Sn mounting, since it is within the heat resistant temperature range of the glass sealing portion 22, the glass sealing portion 122 may be altered. Absent. It should be noted that the glass sealing portion 122 does not change as long as it is lower than the glass transition temperature (Tg point), and if it can be mounted below the glass transition temperature, the same is true even if a material other than Au—Sn is used. The effect of can be obtained. In this manner, mounting at 200 ° C. or higher, which is impossible with conventional resins such as silicone and epoxy, is realized.
(4) Since the heat sink 130 formed of the copper plate material having high thermal conductivity is integrated by the caulking portion 131 and the thickened portion is formed by stacking the thin plates, it is formed in a fin shape. The productivity of the heat dissipating body 103 in which the thickness on the other end side is increased as compared with the one end side is excellent. In addition, since the number of the heat radiating plates 130 can be easily increased / decreased and the heat radiating shape can be easily changed according to the desired heat radiating characteristics, the heat radiating body has appropriate heat radiating properties according to the number of LED elements 20 used and the amount of heat generated. 103 can be manufactured. Furthermore, since the glass-sealed LED 102 serving as a heat source is disposed on the end face of each heat radiating plate 130, the heat generated by each LED element 20 can be directly transferred to each heat radiating plate 130. For this reason, irrespective of the heat transfer degree between each heat sink 130, the heat dissipation equivalent to what branched the front-end | tip of a bulk-shaped heat sink can be obtained by a very simple method. That is, when a conventionally known heat sink such as aluminum is used, since it is an integral molding, it is difficult to mold it thin and long, and there is a problem that it is difficult to mold into a complicated shape while increasing the heat dissipation system. The light emitting device 101 of this embodiment can solve this problem.
(5) By having the structure where the lower part 130b of each heat sink 130 is arrange | positioned radially, the surface area of the heat sink 103 can be enlarged, while dissipating heat from the heat sink 103 efficiently, It can be small and light. Further, a novel appearance as the light emitting device 101 can be given.
(6) Since the glass-sealed LED 102 is used for the light source unit, the temperature change does not occur in a range of several tens of degrees Celsius, as in the case of sealing with a resin member having a relatively high coefficient of thermal expansion. There is no possibility of electrical disconnection due to the stress caused, and there is no possibility that the transparency of the sealing member is lowered and the amount of light is reduced. For this reason, even if the heat dissipation property of the heat dissipating body 103 is the same, in the glass sealing, it is possible to increase the output by supplying more power than in the resin sealing. In the experiments by the inventors, it has been confirmed that the amount of light does not decrease even when a current of 100 mA is applied to the LED element 20 that is supplied with a current of 20 mA and lighting is continuously performed for 2000 hours in an atmosphere of 100 ° C.

  In the seventh embodiment, the blue LED element 20 that emits blue light is used as the light source unit, and the yellow phosphor 107 is dispersed in the glass sealing unit 122, and white light is emitted by a combination of blue and yellow. Although the light emitting device 1 to be obtained is illustrated, for example, white light may be obtained by a combination of an ultraviolet LED element that emits ultraviolet light and a red phosphor, a green phosphor, and a red phosphor. Furthermore, the present invention can also be applied to a light emitting device that directly extracts the light emission color of LED elements such as ultraviolet, purple, blue, green, and red without using a phosphor.

  Moreover, although what used copper as the heat sink 130 was shown in 7th Embodiment, the heat sink 130 is brass (thermal conductivity: 100W / m * K), aluminum (thermal conductivity: 230W), for example. / M · K) or the like. The heat sink 130 preferably has a high thermal conductivity, and is preferably made of a material of 100 W / m · K or more. Further, the integration of the heat sink 130 is not limited to the above-described caulking, but may be performed by soldering using electric welding, solder, brazing material, or the like.

  In the seventh embodiment, the circuit pattern 111 and the wiring layer 140 are electrically connected by Au—Sn bonding. However, for example, they may be bonded by solder bonding. The joining method is arbitrary. Furthermore, the heat radiating body 103 may be subjected to Au plating, Au—Sn plating, or the like, and the heat radiating pattern 113 of the LED element 20 and the heat radiating body 103 may be bonded by ultrasonic bonding. Here, in the resin-sealed LED, ultrasonic waves cannot be transmitted to the joint portion, but in the glass-sealed LED, ultrasonic waves can be transmitted to the joint portion.

  In the seventh embodiment, the heat sinks 130 are bent only at the boundary between the upper part 130a and the lower part 130b. For example, as shown in FIG. The lower part 130b) may be bent a plurality of times. In FIG. 13, the lower part 130b is vertically bent eight times. Thereby, the thermal radiation area of each heat sink 30 per unit volume can be enlarged, and further size reduction of the light-emitting device 101 can be achieved. Note that the heat radiating plates 130 may be bent without being bent.

  Further, in the seventh embodiment, the tip side (the lower part 130b) of each heat sink 130 extends diagonally downward and is arranged radially. However, the shape of the tip side of the heat sink 130 is arbitrary. For example, as shown in FIG. 14, each heat sink 130 has a horizontal portion 130c that extends horizontally from the lower end of the upper portion 130a to the left and right sides, and a lower portion 130d that extends downward from the left and right outer ends of the horizontal portion 130c. You may do it. In FIG. 14, the lower portions 130d of the heat radiating plates 130 are arranged in parallel at a predetermined interval. In FIG. 14, a black layer 132 is formed on the surface of the exposed portion of each heat sink 130. The black layer 132 is formed of, for example, chrome plating or resin. By making the exposed part of the radiator 3 black, the heat dissipation efficiency in the exposed part is improved.

  Furthermore, as shown in FIG. 15, a reflecting mirror 133 may be provided as an optical system that reflects the light emitted from the glass-sealed LED 102 in the seventh embodiment in the central axis direction (upward in FIG. 15). Good. In FIG. 15, the reflecting mirror 133 is made of, for example, ceramic, a resin having a metal vapor-deposited on the surface, and is formed in a hemispherical shape that covers the lower side and the side of the glass-sealed LED 102. Thereby, the central-axis luminous intensity of the light-emitting device 101 can be improved. The reflecting mirror 133 may be formed by the heat radiating plate 30. In this case, the heat radiating area can be increased and the central axis luminous intensity can be improved without increasing the number of parts. Further, the optical system incident from the glass-sealed LED 102 is not limited to the reflecting mirror 133, and for example, a prism, a lens, or the like can be used.

Further, in the seventh embodiment, each of the heat radiating plates 130 is shown as a single plate. However, as shown in FIG. 16, for example, the fin portions 130f are integrally formed on each of the heat radiating plates 130. Thus, the heat dissipating body 103 having a plurality of plates of heat conductive material connected so as to be separated from each other may be formed. A heat radiating body 103 of the light emitting device 101 shown in FIG. 16 includes a pair of heat radiating plates 130 having a main body portion 130e having a thickness of 0.3 mm and a fin portion 130f formed integrally with the main body portion 130e and having a thickness of 0.2 mm. have.
The light emitting device 101 in FIG. 16 will be specifically described. The main body portion 130e of the heat sink 130 has a central portion 130g where the glass-sealed LED 102 is mounted with the plate surface facing in the left-right direction, and an extension portion 130h extending outward in the left-right direction from the front and rear ends of each central portion 130g, have. Each heat sink 130 is formed by shaving. Each of the heat sinks 130 is in surface contact with the left and right inner surfaces of the central portion 130g, and is connected and fixed by Au—Sn bonding, caulking bonding, or the like. As shown in FIG. 16, each heat dissipation plate 130 is in a state in which at least a part is separated from each other because the extending portions 130 h extend in opposite directions. The glass-sealed LED 102 is mounted at the front and rear center of the upper surface of the central portion 130g of each heat sink 130. The main body 130e is provided with a plurality of fin portions 130f extending in the front-rear direction with a spacing of 2.0 mm in the front-rear direction, and the spacing between the front and rear fin portions 130f and the extending portion 130h is also 2.0 mm. It has become. Here, since each fin part 130f is formed in a plate shape, each fin 130f is a plurality of plate members that are connected so that at least a part is separated from each other. In this light emitting device 101, a total of seven fin portions 130f are provided on one heat radiating plate 130, and the horizontal dimensions of the fin portion 130f and the extending portion 130h are the same. Therefore, as shown in FIG. As a whole, it has a comb shape, and as shown in FIG. 17, only the extending portion 130h on the near side is visible in front view.
According to the light emitting device 101, since there is no bonding between the main body portion 130e and the fin portion 130f, bonding resistance does not occur during heat transfer. Further, since the bending process is not required for forming each fin portion 130f, it is not time-consuming to form each fin portion 130f, which is suitable for mass production, and the manufacturing cost can be reduced.

  Furthermore, as shown in FIG. 18, the heat radiating body 103 may be formed of a single member. FIG. 18 shows the light emitting device 101 in which the heat radiating body 103 is composed of a single heat radiating plate 130, and a plurality of fin portions 130 f are formed at equal intervals on the left and right sides of each heat radiating plate 130.

[Eighth Embodiment]
(Configuration of Light Emitting Device 201)
FIG. 19 is a side view of the light emitting device according to the eighth embodiment of the invention.

  The light emitting device 201 includes a glass-sealed LED 202 as a light source formed by sealing the LED element 20 with glass, an aluminum substrate 205 on which the glass-sealed LED 202 is mounted, and the aluminum substrate 205. And a heat radiator 203. The heat dissipating body 203 is formed by integrating a heat dissipating plate 230 formed of a highly heat conductive plate material with a rivet 231. That is, the heat dissipating body 203 has a plurality of heat dissipating plates 230 made of a heat conductive material that are connected so as to be at least partially separated from each other.

  As shown in FIG. 19, the glass-sealed LED 202 is mounted in a state where the LED element 20 is sealed with glass inside a reflection case 202a made of ceramic such as alumina. External terminals are formed on the lower surface of the reflection case 202 a and are electrically connected to the aluminum substrate 205. The glass-sealed LED 202 and the aluminum substrate 205 constitute an LED package 206.

  The radiator 203 has a plurality of radiator plates 230 made of copper having a thickness of 0.3 mm. Each heat sink 230 has a central portion 230a whose plate surface is directed in the vertical direction, and a pair of extending portions 230b that extend downward from the left and right end portions of the central portion 230a and whose plate surface is directed in the horizontal direction. ing. Each heat sink 230 is laminated at the central portion 230 a and caulked by a plurality of rivets 231. Here, the material of the rivet 231 may be metal or resin, but for example, a material having high thermal conductivity such as copper or brass is preferable. Each heat sink 230 is previously formed into a U-shaped cross section by press bending, and the dimensions are set so that the extended portions 230b of each heat sink 230 are equally spaced as shown in FIG. In the present embodiment, the LED package 206 is fixed to the central portion 230 a of the uppermost heat sink 230 in the heat sink 230.

  FIG. 20 is a top view of the light emitting device. As shown in FIG. 20, the aluminum substrate 205 is fixed to the central portion 230a of the uppermost heat sink 230 by screws 205a. Here, although the material of the screw 205a is also arbitrary, for example, a material having high thermal conductivity such as copper or brass is preferable. The aluminum substrate 205 and the upper surface of the heat sink 230 are configured to be in surface contact.

(Effect of 8th Embodiment)
According to the eighth embodiment of the present invention, the following effects can be obtained.
(1) Since the LED package 206 is connected to the heat dissipating body 203, the glass-sealed LED 202 in which the heat dissipating pattern is not formed on the back surface side of the LED element 20 is also heated to the heat dissipating body 203 through the aluminum substrate 205. Can be dissipated. In this embodiment, the reflective case 202a of the glass-sealed LED 202 is alumina having a relatively high thermal conductivity, and the glass-sealed LED 202 is mounted on the aluminum substrate 205 having a relatively high thermal conductivity. The heat generated in the LED element 20 is smoothly transmitted to the heat sink 230. Moreover, since the aluminum substrate 205 and the heat sink 230 are in surface contact, a large heat transfer path to the heat sink 230 can be secured.
(2) Since the heat sink 230 formed of the copper plate material having high thermal conductivity is integrated with the rivet 231 and the thickened portion is formed by laminating the thin plates, both ends formed in a fin shape The productivity of the heat dissipating body 203 in which the thickness on the center side is increased as compared with the side is excellent. Further, since the number of the heat radiating plates 230 can be increased and decreased and the heat radiating shape can be easily changed according to the desired heat radiating characteristics, the heat radiating body having appropriate heat radiating properties according to the number of LED elements 20 used and the amount of heat generated. 203 can be manufactured. Furthermore, since the LED package 206 serving as a heat source is disposed at the central portion 230 a of each heat sink 230, the heat generated by the LED elements 20 can be directly transferred to each heat sink 230. For this reason, irrespective of the heat transfer degree between each heat sink 230, the heat dissipation equivalent to what branched the front-end | tip of a bulk-like heat sink can be obtained by a very simple method.
(3) Since the extended portions 230b of the heat radiating plates 230 are separated from each other, the surface area of the heat radiating body 203 can be increased, heat can be efficiently dissipated from the heat radiating body 203, and It can be small and light. Further, a novel appearance as the light emitting device 201 can be given.
(4) Since the glass-sealed LED is used for the light source part, the temperature change of the light source part does not remain in the range of several tens of degrees C. There is no possibility of electrical disconnection due to the stress caused, and there is no possibility that the transparency of the sealing member is lowered and the amount of light is reduced. For this reason, even if the heat dissipation property of the heat dissipating body 203 is the same, in the glass sealing, it is possible to increase the output by supplying more power than in the resin sealing.

  In the eighth embodiment, one LED package 206 is mounted on one heat radiator 203. For example, as shown in FIG. The LED package 206 may be mounted. FIG. 21 illustrates a light emitting device 201 in which three LED packages 206 are arranged in series with the uppermost heat sink 230. In the light emitting device 201, each LED package 206 is joined to the heat sink 230 by soldering, not by screwing. Moreover, each heat sink 230 is joined not by a rivet but by Au-Sn plating. That is, as shown in FIG. 21, the light emitting device 201 does not use a fastener or the like, exhibits a clean appearance, and can be manufactured by reflow.

  In the eighth embodiment, the LED package 206 in which the LED element 20 is disposed in the reflection case 202a is shown. However, the form of the LED package can be changed as appropriate.

[Ninth Embodiment]
(Configuration of Light Emitting Device 301)
FIG. 22 shows a light emitting device according to the ninth embodiment of the present invention, in which (a) is a side view and (b) is a top view.

  The light-emitting device 301 includes a glass-sealed LED 102 as a light source formed by sealing a plurality of LED elements 20 with glass, and a heat radiator 303 connected to a heat radiation pattern 113 of the glass-sealed LED 102. Yes. The heat dissipating body 303 includes a block member 331 formed in the same shape in cross section with the heat dissipating pattern 113 of the glass-sealed LED 102, a flat heat dissipating plate 330 with the plate surface facing up and down, a metal plate (not shown), and the like. And a base member 332 to be attached. That is, the heat dissipating body 303 has a plurality of heat dissipating plates 330 made of a heat conductive material connected so that all parts are separated from each other.

  The radiator 303 is configured by alternately stacking a plurality of block members 331 and a plurality of flat plate-like heat sinks 330 and connecting the lowermost block member 331 to the base member 332. . Each block member 331 is made of copper and is disposed so as to overlap the heat radiation pattern 113 of the glass-sealed LED 102 in a top view. The vertical dimension of each block member 331 is 2.0 mm. Each block member 331 serving as a heat conducting portion has one pillar extending from the lower portion of the heat radiation pattern 113 to the pedestal member 332 as a whole, although each heat radiating plate 330 is interposed. Each block member 331 is interposed between the glass-sealed LED 102 and each heat sink 330 and transfers the heat of the glass-sealed LED 102 to each heat sink. Each heat sink 330 is made of copper, and is formed in a square shape larger than the glass-sealed LED 102 in a top view. The vertical dimension of each heat sink 330 is 0.3 mm. Each heat radiating plate 330 is fixed by being sandwiched by each block member 331 at the center in a top view. That is, as shown in FIG. 22A, the heat radiating plates 330 are separated from each other by the vertical dimension of each block member 113.

  The pedestal member 332 is made of copper, and is formed in the same shape as each heat radiating plate 330 in a top view. The vertical dimension of the base member 332 is 1.0 mm. The base member 332 is formed with a screw hole 332a for attaching to a metal plate (not shown). The heat radiation pattern 113 of the glass-sealed LED 102, each block member 331, each heat radiation plate 330, and the base member 332 are connected by Au—Sn bonding at 300 ° C. to 350 ° C. in a nitrogen atmosphere. Surface coating is applied.

(Effect of 9th Embodiment)
(1) Since the glass-sealed LED 102 on which a plurality of LED elements 20 are mounted is provided, heat interaction in the element can be reduced and thermal resistance can be reduced as compared with the case where a large-size LED element is mounted. can do. That is, in the case of a large-size LED element, a plurality of LED elements 20 are in contact with each other. Therefore, even if the heat radiation amount to the element mounting substrate 121 per element area is the same, the plurality of LED elements 20 are spaced apart. The temperature rise of the LED element 20 can be suppressed to be lower in the case where the LED element 20 is disposed. In addition to this, in the glass-sealed LED 102 in which the thermal expansion coefficient is small and tensile stress is not generated on the LED element 20 due to the expansion of the sealing material even at a high temperature, the mounting strength of the LED element 20 may be small. The p-side electrode is composed of an ITO electrode and a relatively small p-side pad electrode formed on the ITO electrode, and is mounted with a total of two bumps, one each for the anode and cathode. Luminous efficiency is better than what is mounted.
(2) Since heat is extracted from the heat radiation pattern 113 at the bottom of the glass-sealed LED 102, the heat interaction between the LED elements 20 can be reduced, and this can also reduce the thermal resistance. In particular, since the thickness of the element mounting substrate 121 is thinner than the mounting interval of the LED elements 20, the heat generated in each LED element 20 is greater in the direction of the heat dissipation pattern 113 than in the direction of the adjacent LED elements 20. Will be transmitted. Therefore, the luminous efficiency can be improved also by this.
(3) Since the glass-sealed LED 102 is mounted with Au—Sn having a relatively high thermal conductivity, the heat dissipation efficiency to the heat radiating body 103 is higher than when mounted with solder or the like. In addition, although it is heated to 300 ° C. to 350 ° C. at the time of Au—Sn mounting, since it is within the heat resistant temperature range of the glass sealing portion 22, the glass sealing portion 122 may be altered. Absent. It should be noted that the glass sealing portion 122 does not change as long as it is lower than the glass transition temperature (Tg point), and if it can be mounted below the glass transition temperature, the same is true even if a material other than Au—Sn is used. The effect of can be obtained. In this manner, mounting at 200 ° C. or higher, which is impossible with conventional resins such as silicone and epoxy, is realized.
(4) Since the block member 331 having the same shape in the top view and higher thermal conductivity than the heat dissipation pattern 113 is connected to the heat dissipation pattern 113 of the glass-sealed LED 102, the amount of heat transferred to the heat dissipation pattern 113 is reduced. The block member 331 can be received with a margin. Since the plurality of block members 331 are arranged in series in the heat flow direction from the heat radiation pattern 113, heat is transferred from the upper side to the lower block members 331 without any stagnation. Since each heat dissipation plate 330 made of copper is also interposed in each block member 331, heat is transmitted through each heat dissipation plate 330 and dissipated from the surface of each heat dissipation plate 330. In this embodiment, since the surface of the heat sink 330 is exposed except for the contact portion with the block member 331, the heat dissipation area can be increased. Moreover, since the antirust coating is given to the exposed part of the heat radiating body 330, the heat radiation efficiency is improved as compared with the case where the copper material is exposed on the surface.
(5) Since each block member 331 has a single column shape as a whole, the radiator 303 is structurally stable, and local internal stress is generated between the members due to external force, heat, and the like. There is no such thing, and sufficient strength and reliability can be secured.
(6) Furthermore, since the heat radiating plates 330 formed of a copper plate material having high thermal conductivity are alternately laminated with the block members 331, the number of heat radiating plates 330 corresponding to the heat radiating characteristics of the glass-sealed LED 102 is increased. Easy to increase and decrease. Accordingly, it is possible to manufacture the heat dissipating body 303 having appropriate heat dissipation according to the number of LED elements 20 used and the amount of heat generated. In particular, by setting the interval between the heat radiating plates 330 to 1 to 4 mm, it is possible to have heat dissipation in natural convection without forced air cooling, low cost, and compactness. In the experiments by the inventors, in order to obtain the same heat dissipation, the number of the heat radiating plates 330 and the space between the heat radiating plates 330 were changed. By setting the space between the heat radiating plates 330 to 1 to 2 mm, the most compact dimension was obtained. And obtained the result. For this reason, heat dissipation, low cost, and compactness can be optimized by setting the height of the block member 331 to 2 mm and the distance between the heat dissipation plates 330 to 2 mm.
(7) Furthermore, since the heat radiating plates 330 are separated from each other, the surface area of the heat radiating body 303 can be increased, heat can be efficiently dissipated from the heat radiating body 303, and the heat radiating body 3 can be reduced in size and weight. It can be. In particular, the high-power LED elements 20 can be arranged at narrow intervals, and a large heat sink is not necessary, which is extremely advantageous in practical use. Further, a novel appearance as the light emitting device 301 can be given. In addition, when performing forced air cooling, the space | interval of the heat sink 330 can be set to 1 mm or less, and it can achieve further compactization.
(8) Since the screw hole 332a is formed in the base member 332, the light emitting device 301 can be easily fixed. Furthermore, since the fastening member is attached to the pedestal member 332 that is farthest from the glass-sealed LED 202 that is the heat generating portion, the thermal load applied to the fastening member can be reduced.

  In the ninth embodiment, the block members 331 and the heat radiating plates 330 are alternately laminated. However, for example, as shown in FIG. It is good also as a structure which provided the column member 334 which penetrates the heat sink 330. The column member 334 is made of copper, cut out from the same member, and formed in a columnar shape. Each heat radiation plate 330 is formed with a circular insertion hole 330a through which the column member 334 is inserted in a plan view. In addition, a spacer 335 made of copper is interposed between the heat radiating plates 330. Each spacer 335 is also formed with an insertion hole 335a having a circular shape in plan view through which the column member 334 is inserted. A connection portion 334 a connected to the heat radiation pattern 113 of the glass-sealed LED 102 is formed on the top of the column member 334. The connecting portion 334 a has a larger diameter than the main body portion 334 b of the column member 334 and abuts on the upper surface of the uppermost heat sink 330. The lower end of the main body portion 334 b is connected to the pedestal member 332, and each spacer 335 and each heat sink 330 are sandwiched between the connection portion 334 a and the pedestal member 332. In FIG. 23, each part of the light-emitting device 301 is connected by Ag brazing bonding, anticorrosion coating is applied after the connection, and the glass-sealed LED 102 is mounted by Au—Sn bonding. The column member 334 does not have a joint of a plurality of members, is not affected by the thermal resistance of the joint, and conducts heat from the glass-sealed LED 102 downward in FIG. Since the column member 334 is made of copper having high thermal conductivity, the entire column member 334 has substantially the same temperature, and can efficiently transfer heat to each heat radiating plate 330.

  Further, as shown in FIG. 24, a highly reflective layer 330 b may be formed on the upper surface of the uppermost heat sink 330. The high reflection layer 330b may be a white paint applied to the surface of the heat radiating plate 330, or may be a silver high reflectance metal deposited on the surface. With respect to light emitted downward from the glass-sealed LED 102 in 303, the light extraction efficiency can be improved by improving the reflectance of the radiator 303. The light emitting device 301 is manufactured by separating the heat radiating plates 330 with a jig or the like when the heat radiating plate 330 and the column member 334 are joined, and removing the jig or the like after the joining is completed.

  Furthermore, in the ninth embodiment, a plurality of flat plate-like heat sinks 330 each having a plate surface facing up and down are provided. For example, as shown in FIG. Each extending heat dissipation plate 330 may be provided. In FIG. 25, a column member 334 is formed in a square column shape, and a plurality of heat dissipation plates 330 are bonded to the side surface of the column member 334 by Au—Sn bonding. As shown in FIG. 25B, each heat radiating plate 330 has a joint portion 330c having a shape along the side surface of the column member 334 and an extending portion 330d extending radially outward from the end portion of the joint portion 330c. is doing. In the light emitting device 301, two heat radiating plates 330 are attached to the four side surfaces of the column member 334 in a state where the joint portions 330 c are stacked. Moreover, as shown to Fig.25 (a), the column member 334 is formed so that it may protrude below rather than each heat sink 330 by side view.

  In the ninth embodiment, the heat radiating plates 330 are arranged side by side in the vertical direction. However, the direction in which the heat radiating plates 330 are arranged side by side is arbitrary, for example, as shown in FIGS. The heat radiating plates 330 may be arranged in front and back. 26 to 28, the X, Y, and Z directions are the left-right, front-back, and up-down directions, respectively. As shown in FIG. 26, the plurality of heat radiating plates 330 made of copper are connected to a column member 334 that extends back and forth on the upper end side. Of the heat radiating plates 330, those arranged at both front and rear ends have a thickness of 0.3 mm, and those arranged at the front and rear inner sides have a thickness of 0.1 mm, with an interval of 0.2 mm in the front and rear. Are arranged side by side. The column member 334 is made of copper, and as shown in FIG. 27, a glass-sealed LED 102 is mounted at the front and rear center of the upper surface of the column member 334. As shown in FIG. 28, the column member 334 has a rectangular shape of 2 mm in the left and right direction and 6 mm in the up and down direction when viewed from the front. A notch 330e for receiving the column member 334 is formed at the upper left and right central upper ends of each heat radiating plate 330. The column member 334 and each heat sink 330 are joined by silver brazing. In the light emitting device 301, the glass-sealed LED 102 is mounted on the column member 334 after heating the column member 334 to each heat sink 330 by silver brazing by heating to 800 ° C. or higher. According to this light-emitting device 301, even when installed so that the Z direction is on the upper side or even when installed so that the X direction is on the upper side, the air of each radiator plate 330 is caused by natural convection. Can be sent to the outside.

[Tenth embodiment]
(Configuration of Light Emitting Device 401)
29 and 30 relate to the tenth embodiment of the present invention, FIG. 29 is an exploded perspective view of the light emitting device, and FIG. 30 is a perspective view of the light emitting device.

  As shown in FIG. 29, the light emitting device 401 includes a glass-sealed LED 2 as a light source formed by sealing the LED element 20 with glass, and a reflecting mirror 533 that reflects light emitted from the glass-sealed LED 2. An upper radiator 403 and a lower radiator 503 formed by integrating a plurality of radiator plates 430 and 530 formed of a plate material having high thermal conductivity, and a covering member 450 (see FIG. 30). That is, each of the heat dissipating bodies 403 and 503 has a plurality of heat dissipating plates 430 and 530 made of a heat conductive material that are connected so as to be at least partially separated from each other. The glass-sealed LED 2 is fixed to the lower surface of the upper radiator 403 and is electrically connected to a wiring (not shown) formed on the lower surface of the upper radiator 403.

  The upper radiator 403 and the lower radiator 503 have a cylindrical shape as a whole, and are connected at the lower end of the upper radiator 403 and the upper end of the lower radiator 503. The glass-sealed LED 2 and the reflecting mirror 533 are interposed at the connection portions of the heat radiators 403 and 503. Each of the radiators 403 and 503 has a plurality of radiator plates 430 and 530 made of copper having a thickness of 1.0 mm. In the present embodiment, the radiators 403 and 503 are configured by connecting the three radiator plates 430 and 530 divided in the radial direction in the radial direction.

FIG. 31 is a component diagram of the radiator, where (a) is a top view of the upper radiator and (b) is a bottom view of the lower radiator.
As shown in FIG. 31A, the heat radiating plate 430 of the upper heat radiating body 403 extends vertically and has a fan shape in a top view. Each radiator plate 430 includes a pair of string portions 430a formed to have a central angle of 120 °, a pair of arc portions 430b extending in the circumferential direction so as to be close to each other from the radial outside of each string portion 430a, and each arc portion And an extending portion 430c extending radially inward from the tip of 430b. Each extending part 430c is arranged to face each other with a predetermined interval. By connecting the chord portions 430a of the three heat radiating plates 430 formed in this way, the upper heat radiating body 403 has a cylindrical shape as a whole.

  In the present embodiment, the glass-sealed LED 2 is provided on the lower surface of the connection portion of each string portion 430a. That is, light is emitted downward from the glass-sealed LED 2. The installation position of each glass-sealed LED 2 is the center in the radial direction of each string portion 430a.

  As shown in FIG. 31B, the heat radiating plate 530 of the lower heat radiating body 503 extends vertically and has a fan shape in a top view. Each heat dissipation plate 530 includes a pair of string portions 530a formed to have a central angle of 120 °, a pair of arc portions 530b extending in the circumferential direction so as to be close to each other from the radially outer side of each string portion 530a, and each arc portion And an extending portion 530c extending radially inward from the tip of 530b. Each extending part 530c is arranged to face each other with a predetermined interval.

  Furthermore, each heat sink 530 includes a first folded portion 530d extending from the radially inner end of the extending portion 530c in the same direction as the string portion 530a on the proximal end side, and a proximal side from the end of the first folded portion 530d. And a second folded portion 530e extending in the same direction as the arc portion 530b. By connecting the string portions 530a of the three heat radiating plates 530 thus formed, the lower heat radiating body 503 has a cylindrical shape as a whole.

  The upper radiator 403 and the lower radiator 503 are connected such that the string portions 430a and 530a and the arc portions 430b and 530b coincide with each other in a top view. At the upper end of the lower radiator 503, a reflecting mirror 533 is installed so as to overlap each glass-sealed LED 2 installed on the upper radiator 403 in a top view. The reflecting mirror 533 is made of, for example, a resin having a metal deposited on its surface, a metal plate, or the like, and is formed in a hemispherical shape that covers the lower side of the glass-sealed LED 2. A notch 530f for receiving the reflecting mirror 533 is formed at the upper ends of the string portion 530a and the first folded portion 530d of each heat radiating plate 530. In the light emitting device 401, the light of the glass-sealed LED 2 is reflected upward by the reflecting mirror 533, and the light is extracted in a state where it is condensed at the upper opening of the upper radiator 403.

  The covering member 450 is formed of a material having a lower thermal conductivity than the heat dissipating bodies 403 and 503, and has a cylindrical shape. In the present embodiment, the heat dissipating bodies 403 and 503 are caulked from the outside by the covering member 450. As the covering member 450, a metal that can be easily laser-welded, such as stainless steel, is used.

(Effect of 10th Embodiment)
According to the tenth embodiment of the present invention, the following effects are obtained.
(1) By condensing the light emitted from the glass-sealed LED 2 using the reflecting mirror 533, the light emitting device 401 can be used as a spot light source. Here, when it is necessary to arrange the glass-sealed LED 2 and the reflecting mirror 533 inside the heat dissipation system, the upper heat radiator 403 on which the glass-sealed LED 2 is mounted, and the lower heat radiator 503 on which the reflector 533 is provided, Therefore, the light emitting device 401 can be assembled easily and easily. Further, since the divided upper radiator 403 and lower radiator 503 are caulked by the covering member 450, the heat generated in the glass-sealed LED 2 is transferred to the lower radiator 503 via the upper radiator 403. Can communicate.
(2) Further, by covering the heat dissipating bodies 403 and 503 with the covering member 450 having a low thermal conductivity, the covering member 450 has a lower temperature than the heat dissipating bodies 403 and 503, and external components adjacent to the light emitting device 401. And the like are not overheated, which is very convenient when holding the light emitting device 401 or the like.
(3) Since the heat-radiating plates 430 and 530 formed of a copper plate material having high thermal conductivity are integrated and the thickened portion is formed by laminating thin plates, the productivity of the heat-dissipating bodies 403 and 503 is increased. Excellent. In addition, since the number of heat radiation plates 430 and 530 can be increased or decreased according to desired heat radiation characteristics and the heat radiation shape can be easily changed, it has appropriate heat radiation properties according to the number of LED elements 20 used and the amount of heat generated. The radiators 403 and 503 can be manufactured. Furthermore, since the glass-sealed LED 2 serving as a heat source is disposed on the end face of the heat radiating plate 430, the heat generated by each LED element 20 can be directly transferred to the heat radiating plate 430.
(4) Since each heat radiating plate 430, 530 has the extending portions 530d, 530e, the surface area of each heat radiating body 403, 503 can be increased, and heat can be efficiently dissipated from each heat radiating body 403, 503. The heat radiators 403 and 503 can be made small and light. Since the lower radiator 503 has the folded portions 530d and 530e, the surface area is significantly increased.

  In the tenth embodiment, the covering member 450 generally covers the outer surface of each of the radiators 403 and 503. For example, as shown in FIGS. You may make it cover a part of outer surface of each thermal radiation body 403,503.

FIG. 32 illustrates the covering member 450 that covers the vicinity of the connection portion between the heat radiators 403 and 503. Thereby, the heat dissipation performance of each heat radiator 403,503 can be improved, without impairing the caulking function of each heat radiator 403,503.
FIG. 33 shows a covering member 450 that covers the heat dissipating bodies 403 and 503 as a whole and has a plurality of holes 450a. Thereby, the gripping property by the covering member 450 is not impaired, and the heat of each heat radiator 403, 503 can be radiated to the outside through each hole 450a, which is extremely advantageous in practical use.

  In the tenth embodiment, the heat dissipation system is divided into the upper heat dissipating body 403 and the lower heat dissipating body 503. Of course, the heat dissipating system may be integrally formed. is there. Further, a material having a relatively high thermal conductivity may be interposed between the radiators 403 and 503 and the covering member 450 so that the heat conduction between the radiators 403 and 503 is good. Furthermore, the shapes of the upper radiator 403 and the lower radiator 503 are also arbitrary, and may be formed in, for example, a rectangular tube shape in addition to the cylindrical shape as in the above embodiment.

[Eleventh embodiment]
(Configuration of Light Emitting Device 601)
34 to 36 show an eleventh embodiment of the present invention. FIG. 34 is a top view of the light emitting device, FIG. 35 is a cross-sectional view taken along line AA in FIG. 34, and FIG. FIG.

  As shown in FIG. 34, the light-emitting device 601 includes a glass-sealed LED 602 as a light source formed by sealing an LED element 620 with glass, and a radiator 603 on which the glass-sealed LED 602 is mounted. Have. The heat radiating body 603 is formed by integrating a plurality of large heat radiating plates 630 and a plurality of small heat radiating plates 635 formed of a highly heat conductive plate material by Au-Sn bonding. That is, the heat radiating body 603 includes a plurality of heat radiating plates 630 and 635 made of a heat conductive material that are connected so as to be at least partially separated from each other.

  In the present embodiment, the LED element 620 is formed in a size of 220 μm × 480 μm in a top view and is long in the front-rear direction. And glass-sealed LED602 is comprised by arranging the element 620 in the elongate direction for three LED elements. The glass-sealed LED 602 is formed in a size of 1.0 mm × 3.2 mm in a top view, the thickness of the Al 2 O 3 substrate is 0.25 mm, and the thickness of the glass sealed portion is 0.8 mm. .

  The heat radiating body 603 includes two large heat radiating plates 630 made of copper having a thickness of 0.5 mm and seven small heat radiating plates 635 made of copper having a thickness of 0.1 mm. The large heat radiating plate 630 includes a central portion 630a where the glass-sealed LED 602 is mounted with the plate surface facing in the left-right direction, and an extending portion 630b extending outward in the left-right direction from the front and rear ends of the central portion 630a. Yes. As shown in FIG. 35, the lower end of the center part 630a is located above the lower end of the extending part 630b. The two large heat radiating plates 630 are in surface contact with the left and right inner surfaces of the central portion 630a, and are connected and fixed by Au—Sn bonding.

In addition, a hole portion 630c in which the glass-sealed LED 602 and the reflecting mirror 633 are disposed is formed in the central portion 630a of the large heat radiating plate 630. The glass-sealed LED 602 is installed on the lower surface of the upper portion of the hole 630c and emits light downward. The reflecting mirror 633 is installed below the glass-sealed LED 602 so as to reflect this light upward. The reflecting mirror 633 is made of, for example, a resin or a metal plate having a metal deposited on its surface, and is formed in a rotating paraboloid shape that opens upward and focuses on the glass-sealed LED 602. Further, the reflecting mirror 633 has a flange portion 633a that extends outward at the periphery. As shown in FIG. 34, a notch 633b for receiving the large heat radiating plate 630 is formed in the flange portion 633a, and the reflecting mirror 633 is fitted into the large heat radiating plate 630.

  The small heat radiating plates 635 are arranged so that the plate surfaces face in the front-rear direction, and are connected to the lower end of the central portion 630 a of the large heat radiating plate 630. As shown in FIG. 36, a notch 635a for receiving the large heat radiating plate 630 is formed at the upper left and right central ends of the small heat radiating plate 635. The small heat radiating plate 635 and the large heat radiating plate 630 are connected and fixed by Au—Sn bonding.

(Effect of 11th Embodiment)
According to the eleventh embodiment of the present invention, the glass-sealed LED 602 is not exposed to the outside, so that the appearance is clean and the glass-sealed LED 602 can be protected accurately. In addition, by providing the reflecting mirror 633, the light emitted from the glass-sealed LED 602 can be emitted to the outside after having a desired light distribution state. Furthermore, the strength and durability of the apparatus are ensured by forming the large heat sink 630 forming the outer portion relatively thick, and the weight can be reduced by forming the small heat sink 635 disposed on the inside relatively thin. Can do.

[Other embodiments]
The present invention is not limited to the above embodiments, and various modifications can be made without departing from or changing the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Light-emitting device, 2 ... Glass sealing LED, 2A ... LED, 3 ... Heat sink, 4 ... Wiring board, 4A ... Opening, 4B ... Through-hole, 5 ... Au stud bump, 20 ... LED element, 21 ... Al ₂ O ₃ substrate, 22 ... glass sealing part, 23 ... phosphor-containing silicone, 24 ... Si submount, 24A ... circuit pattern, 24B ... conductive pattern, 30 ... heat sink, 30A ... fin, 31 ... caulking part, 34 DESCRIPTION OF SYMBOLS ... Radiator, 40 ... Insulating layer, 41 ... Wiring layer, 42 ... Al vapor deposition film, 50 ... Reflector part, 50A ... Reflector mirror surface, 101 ... Light emitting device, 102 ... Glass-sealed LED, 103 ... Radiator, 104 ... Circuit board, 107 ... phosphor, 110 ... circuit pattern, 110a ... W layer, 110b ... Ni layer, 110c ... Au layer, 111 ... circuit pattern, 111a ... W layer, 111b ... Ni layer, 111c ... Au layer 112 via pattern, 113 ... heat dissipation pattern, 121 ... element mounting substrate, 122 ... glass sealing part, 130 ... heat sink, 130a ... upper part, 130b ... lower part, 130c ... horizontal part, 130d ... lower part, 130e ... main body part, 130f ... fin part, 130g ... center part, 130h ... extension part, 131 ... caulking part, 132 ... black layer, 133 ... reflecting mirror, 140 ... wiring layer, 141 ... insulating layer, 200 ... sapphire substrate, 201 ... light emitting device, 202 ... Glass-sealed LED, 202a ... Reflective case, 203 ... Radiator, 205 ... Aluminum substrate, 205a ... Screw, 206 ... LED package, 210 ... Circuit pattern, 211 ... Circuit pattern, 212 ... Via pattern, 212A ... Via hole, 213 ... Radiation pattern, 230 ... Radiation plate, 230a ... Central part, 230b ... Extension part, 231 ... Ri 290: sapphire substrate, 291 ... buffer layer, 292 ... n-GaN layer, 293 ... light emitting layer, 294 ... p-GaN layer, 295 ... n-side electrode, 296 ... p contact electrode, 300 ... case part, 301 DESCRIPTION OF SYMBOLS ... Light-emitting device, 303 ... Radiator, 330 ... Heat sink, 330a ... Insertion hole, 330b ... High reflection layer, 330c ... Joint part, 330d ... Extension part, 330e ... Notch, 331 ... Block member, 332 ... Base member, 332a ... Screw hole, 334 ... Column member, 334a ... Connection part, 334b ... Main body part, 335 ... Spacer, 335a ... Insertion hole, 401 ... Light emitting device, 403 ... Upper radiator, 430 ... Heat radiator, 430a ... String part, 430b ... arc part, 430c ... extension part, 450 ... covering member, 450a ... hole part, 503 ... lower heat radiator, 530 ... heat radiator, 530a ... string part, 530b ... arc part, 5 30c ... Extension part, 530d ... First folding part, 530e ... Second folding part, 533 ... Reflecting mirror, 601 ... Light emitting device, 602 ... Glass sealed LED, 603 ... Heat radiator, 620 ... LED element, 630 ... Large size Heat sink, 630a ... center, 630b ... extension, 630c ... hole, 633 ... reflector, 633a ... flange, 633b ... notch, 635 ... small heat sink, 635a ... notch

Claims (9)

A light source having an element mounting substrate on which a light emitting element is mounted on the front surface and a metallized wiring pattern and a heat dissipation pattern are provided on the back surface;
A radiator,
With
The wiring pattern is electrically bonded to a wiring board,
The heat dissipating pattern is joined to the heat dissipating body from the open portion provided on the wiring board,
The wiring pattern and the wiring board, and the heat dissipation pattern and the heat dissipation body are bonded by the same bonding material,
The light source transmits heat generated from the light emitting element directly to the heat radiating body through the heat radiating pattern. A plurality of the light emitting elements are mounted on the surface of the element mounting substrate,
The light emitting device according to claim 1, wherein a thickness of the element mounting substrate is thinner than a mounting interval between the plurality of light emitting elements.   The light emitting device according to claim 1, wherein the bonding material is made of solder or Au—Sn.   4. The light emitting device according to claim 1, wherein an area of the light source in plan view is within 10 times a total area of the plurality of light emitting elements. 5.   The light-emitting device according to claim 1, wherein the light-emitting element is formed by sealing with glass.   The light emitting device according to claim 5, wherein the glass has a thermal expansion coefficient equivalent to that of the light emitting element and the element mounting substrate.   The light-emitting device according to claim 1, wherein a black layer is formed on a surface of the heat radiating body.   The light emitting device according to claim 1, wherein the heat radiating body has a reflectance of 70% or more. The light emitting device according to claim 7, wherein a surface of the heat radiating body is plated.

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